Contract award notice – utilities
Section I: Contracting
entity
I.1) Name and addresses
NATIONAL ENERGY SYSTEM OPERATOR LIMITED
11014226
St Catherine's Lodge Bearwood Road
Wokingham
RG415BN
UK
Contact person: Maria Slimpa
E-mail: maria.slimpa12@neso.energy
NUTS: UKJ11
Internet address(es)
Main address: https://www.neso.energy/
I.6) Main activity
Other: Utilities
Section II: Object
II.1) Scope of the procurement
II.1.1) Title
Telephony Services
II.1.2) Main CPV code
64200000
II.1.3) Type of contract
Services
II.1.4) Short description
Provision of a fully managed Microsoft Teams Direct Routing telephony service for National Energy System Operator (NESO), including solution design, deployment, migration, hosted session border controllers (SBCs), site survivability via SBAs, PSTN connectivity, analogue gateway replacement, IP handsets, monitoring, incident management, service desk, configuration and asset management, governance reporting, security and data‑protection compliance, and full exit support. The Supplier delivers end‑to‑end transition, operational service management and ongoing support for the telephony estate for the duration of the contract.
II.1.6) Information about lots
This contract is divided into lots:
No
II.1.7) Total value of the procurement
Lowest offer:
/ Highest offer:
II.2) Description
II.2.3) Place of performance
NUTS code:
UK
II.2.4) Description of the procurement
The procurement covers the end‑to‑end provision of a fully managed Microsoft Teams Direct Routing telephony service for the National Energy System Operator (NESO). The scope includes the design, deployment, migration and operation of a complete enterprise voice solution, including: hosted Session Border Controllers (SBCs) in Vodafone's cloud environment, PSTN connectivity, number management, analogue gateway replacement, site survivability via SBAs, supply and configuration of IP handsets and ATAs, service desk and 24/7 operations, monitoring, incident and problem management, service reporting, asset and configuration management, governance support, security and data‑protection compliance, and full exit management.
Services include delivery of a structured implementation project, functional and non‑functional testing and acceptance, operational service management aligned to ITIL, monthly performance reporting, and compliance with NESO's security, data protection and subcontractor obligations.
The contract provides telephony services for up to 4,000 users, including managed PSTN breakout, resilient architecture across multiple NESO sites, GSM/4G fallback, and full lifecycle management of deployed telephony assets. The Supplier must also support NESO in exit and transition to any replacement supplier.
II.2.11) Information about options
Options:
Yes
Description of options:
The Agreement includes an option for NESO to extend the contract term by up to two additional periods of 12 months each (maximum 24‑month extension) beyond the initial 5‑year term. Extension is entirely at NESO's discretion and follows the same contractual terms, subject to any applicable charge adjustments.
II.2.13) Information about European Union funds
The procurement is related to a project and/or programme financed by European Union funds:
No
Section IV: Procedure
IV.1) Description
IV.1.1) Type of procedure
Negotiated with call for competition
IV.1.8) Information about Government Procurement Agreement (GPA)
The procurement is covered by the Government Procurement Agreement:
Yes
IV.2) Administrative information
IV.2.1) Previous publication concerning this procedure
Notice number in the OJ S:
2021/S 000-000004
Section V: Award of contract
A contract/lot is awarded:
Yes
V.2 Award of contract
V.2.1) Date of conclusion of the contract
04/02/2026
V.2.2) Information about tenders
The contract has been awarded to a group of economic operators:
No
V.2.5) Information about subcontracting
Section VI: Complementary information
VI.4) Procedures for review
VI.4.1) Review body
The Cabinet Office
London
UK
VI.5) Date of dispatch of this notice
10/03/2026